Cut-off means for spiral pumps.



T. OCONNOR. CUT-OFF MEANS FOR SPIRAL PUMPS. APPLICATION FILED APR. 10. I913. RENEWED 05c. 16, I915.

Patented July 3, 1917.

2 SHEETS-SHEET 1.

T. OCONNOR. CUT-OFF MEANS FOR SPIRAL PUMPS. APPLICATION 'FILED APR. l0. I9I3. RENEWED DEC. 16,!915.

Patented J 11137 3, 1917.

2 SHEETS-SHEET 2.

Suva 1 602:

llTEW SATES N F@.

THOMAS O'CONNOR, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE O CONNOR SPIRAL PUMP AND BLOWER COMPANY, A CORPORATION OF DELAWARE.

CUT-OFF MEANS FOR SPIRAL PUMPS.

earned Specification of Letters Patent.

Patented July a, 19117.

Application filed April 10, 1913, Serial No. 760,271. Renewed December 16,.1915. Serial No. 67,300.

I To all whom it may concern:

Be it known thatI, THOMAS OCoNNoR, a citizen of the United States, residing in the city of Philadelphia, county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Cut-Off Means for Spiral Pumps, of which the following is a specification.

My invention relates to improvements in cut-ofl means for spiral pumps, and is particularly applicable to double spiral pumps of the character shown in Letters Patent of the United States No. 1,047,436, issued to me'December 17th, 1912.

Although my invention is particularly adapted for use in connection with a pump of this character, it should be understood that the principle thereof is not limited to such a pump but is also applicable and desirable for use upon spiral pumps of other constructions.

My invention has for one of its objects to provide a construction of cut-off means the operation of which produces a minimum amount of jarring and vibration of the pump mechanism.

My invention also has for an object to provide a cut-ofi means having a revoluble movement in relation to the spiral revoluble member of the pump instead of a reciprocatory movement with relation thereto. It is by the provision of a revoluble cut-01f means instead of a reciprocatory means that I am enabled to reduce, in a very large measure, the vibration and jarring effects to which reference has been made. I am also enabled to simplify veryinaterially and substantially the construction of operating mechanism of the pump thereby reducing materially and substantially the cost of construction.

By the employment of a revoluble cut-01f means of the character illustrated in the drawings in connection with a double spiral pump, also illustrated in the drawings, the pressures upon the opposite end portions of the pump are equalized.

To these and other ends my invention comprehends the construction hereinafter set forth in detail in the specification, particularly pointed out in the claims, and illustrated in the drawings, in which,

Figure 1 is a vertical longitudinal sectional view of a double spiral pump em. bodying my invention, certain parts of the details of construction may be made within the scope of the claims without departing from the principle of my invention.

Having reference to the drawings, 1 des-v ignates a base upon whichthe cylindrical casing of the pump is mounted. The said casing is constructed in two parts 2 and 3 which are complemental to each other. These sections are provided respectively with flanges 4 and 5 which are comple mental to each other and which are adapted to be secured together by means of-screwthreaded bolts 6, thereby connecting the two sections 2 and 3 of the cylindrical casing to each other. The upper section 3 of the said cylindrical casing is-provided with the housing 8 for a purpose which will hereinafter appear.

The upper section 3 of the cylinder is provided with an inlet port 10 for the entry of Water or other fluid and with a port 11 for the issuance or discharge of such water or other fluid therefrom.

The construction and operation of the drum 15 having the spirals 16 and 17 formed therein upon the opposite sides of a central dividing section 18, are substantially the same as illustrated in my patent aforesaid and will not be described at length.

The sections 2 and 3 of the casing are provided midway-between vtheir ends with flanges 20 and 21 which flanges are complemental to each other and are circular, inclosing or surrounding the central portion of the drum 15. The said drum is provided at its central portion with an annular groove 22 in which the edges of the said flanges 20 and 21 are situated.

- Plates 24 and 25 are secured to the opposite ends of the drum 15 closing the open outer edges of the spiral passage-ways 16 and 17. These plates are provided with shafts 26 and 27 which extend through openings 30 in plates 31 secured to and closing the opposite ends of the cylinder The said shafts 26 and 27 extend through and are supported in bearings 38 formed in posts or standards 40, as shown.

The shaft 27 is provided with a driving wheel 41 by means of which the drum 15 may be driven.

The drum 15 is of less diameter than that of the cylinder so that annular spacesor chambers 42 are provided between the cylindrical surface of the said drum and the interior surface of the casing upon opposite sides of the circular flanges upon the sections of the casing. These annular chambers are closed by means of blocks 43 secured upon the portions of the said drum upon opposite sidesof the dividing portion or section 18. The said blocks are situated adjacent to the edges of the openings of the spiral passage-ways 16 and 17, as is shown in. Figs. 2 and 3 of the drawings. The said blocks are each provided with narrow transversely extending slots or notches 45 for containing water which acts as packing to more thoroughly close the annular chambers 42.

5O designates a revoluble cut-off means which is situated in the housing 8. The opposite ends of the said cut-off means are provided with trunnions 51 which project through openings 52 in the plates 31.

53 designates packing surrounding the said trunnions, said packing being held in position by means of flanges 54 and glands 55 having connection with the said flanges by means of screw-threaded bolts 56. The outer ends of the said trunnions 51 are supported in bearings 57 at the upper ends of the supporting posts or standards 40. Y

The trunnion 51 at the right hand side of Fig. 1 is provided at its outer end with a spur gear 60 in engagement with a spur gear 61 supported upon the outer end of the shaft 26. The latter gear 61 drives the gear 60 to cause revolution of the revoluble cutoff means 50. It should be noted here that the said gears 60 and 61 areof the same diameter and pitch so that the shafts 51 rotate with the same speed as the trunnions 26 and 27.

This is a very desirable feature of operation because as a result thereof the operation is such that the said revoluble means 50 acts as a more effective or eflicient cut-off or abutment than it would if its cylindrical surface traveled at thesame rate of speed as that of the cylindrical surface of the drum 15.

If the construction were such that in the operation of the pump these two cylindrical surfaces traveled at the same rate of speed the tendency would be to cause the water or air or other gas, as the case might be, to pass forward between the said surfaces so that the operation would not attain the efficiency of which it is capable when the cylindrical surface of the revoluble cut-off means moves at a lower speed than that of the cylindrical surface of the drum 15.

The essential idea in so far as this particular feature of the operation is concerned is that the opposing cylindrical surface of the revoluble cut-off means shall travel at a slower speed than that of the opposing coacting cylindrical surface of the drum.

In order to provide for the passage of the blocks 43 underneath or in relation to the revoluble cut-olfmeans 50, I have provided recesses in the said means, as indicated at 62, the curvature of which recesses, as appears from an inspection of Fig. 2 of the drawings, approximates that of the curvature of the interior surface of the drum casing. The relation of the recess to the casing and to the outer surface of the block 43 is evident from the showing in Fig. 2. It will be apparent from an inspection of Fig. 2 that, when the revoluble member 50 is in such position that the center of curvature of the recess 62 is coincident or is in alinementwith the axis ofthe casing 2, it does not project into the interior of the casing 2.

The relation of the forward part 62 of the block 43 to the recess 62 is such that there is always a clearance between the said forward part 62 and the bottom of said recess so that the water or other fluid which is being pumped may pass between the bottom of said recess and the said forward part and thereby prevent pocketing of such fluid in the said recess and thereby as a result prevent the occurrence of unnecessary shocks to cause unnecessary vibration of the apparatus.

The recesses 62 are situated upon opposite side portions of the revoluble means 50 and in positions corresponding to the paths of movement of the blocks 43 on the drum 15.

As is suggested in the foregoing description when the radii of curvatures of the recesses 62 approximate the curvature of the interior surface of the casing the formation of pockets in which substantially inclosed bodies of water or other fluid may be collected is prevented. The result of such pre vention has already been set forth.

At the point 65 the block'43 is situated sufficiently close to a point upon the concaved surface of the coactingcut-away or recessed portion 62 to .prevent the passage of the water or other fluid between the sald block 43 and the revoluble cut-ofl' means 50.

It will be understood that in the operation of the pump the drum may be driven in the to pass between the said drum and the said direction indicated by the arrow 66 in the the block 43 will soon travelbeyond the port 10 so that the water or other fluid entering therethrough will pass into one of the annular chambers 42 in rear of the said block, and will be confined between the' same and the revoluble means 50, it being understood that by the time the rear end portion of the block 43 passes beyond the' means 50 the cylindrical portion of such means will have come into cooperative relation with the cylindrical drum 15.

In. order to prevent friction between the revoluble member 50 and the cylindrical drum 15, the surfaces thereof are very slightly separated from each other, as indicated in the drawings, such separation, however, being insufficient to permit the water revoluble means to any appreciable extent.

I claim 1. In a spiral pump, the combination of a cylindrical casing, a revoluble drum situated therein of less diameter than the internal diameter of the said casing, whereby an annular chamber is formed between the said drum and the said casing, and the said drum having means thereon for closing the said annular chamber, revoluble cylindrical cutoff means of less diameter than the said drum and cooperating therewith, the said means having a curved recess to permit the passage of the ineansupon the saiddrum for closing the said annular chamber, the radius of curvature of the bottom of the said recess being substantially the same as that of the said casing, and means for causing revolution of the said drum and the said revoluble cut-ofl" means.

2. In a double spiral pump, the combination of a cylindrical casing, a cylindrical drum having spiral passage-ways in theopposite end portions thereof, the diameter of the said .drum being' less than the in- .ternal diameter of the said casing, and the said drum being provided with means thereon for closing the annular chambers between the'said drum and the said casing, a revoluble cut-ofi cylinder of a diameter I substantially half that of said drum and being parallel thereto, the said cylinder being provided with curved recesses to permit the passage of the said means upon the said drum, the radii of curvature of the said recesses being substantially the same as the radius of the 'said casing, such recesses being situated in the opposite end portions of the said cylindrical cut-ofi means and upon.

opposite sides thereof, and means for causing revolution of the said drum and the 3. In a spiral pump, the combination of a cylindrical casinghaving a housing secured thereon, a drum situated in the said casing and having a double spiral passageway, the said drum being of less diameter than the internal diameter of the said cylindrical casing, whereby annular chambers are formed between opposite end portions of the said drum and the said casing, and the said drum being provided with means for interrupting the continuity of the said annular chambers, a revoluble cylindrical cut-ofl member arranged in cooperative relation to the said drum and being of less diameter than the same, the said cylindrical cut-ofi' member being situated in the said housing and being providedwith recesses in the opposite end portions thereof, such recesses being. upon opposite sides of the said cut-0fl" member, the surfaces of the bottoms of said recesses being curved for coacting with the convexed surfaces of the said means upon the said drum, the radii of curvature of the bottoms of said recesses being substantially equal to the radii of convexity of said convexed surfaces for the purpose set forth.

4. In a spiral pump the combination of a cylindrical casing, a revoluble drum situated therein of less diameter than the internal diameter of the said casing whereby an annular chamber is formed between the said drum and the said casing and the said drum having means thereon for extending across the said annular chamber, revoluble cylindrical cut-off means of less diameter than said drum and cooperating therewith for the purpose stated, the said cut-ofl means having a recess with a curved bottom to permit the passage of the means upon the said drum for closing the said annular chamber, the radius of curvature of said bottom being substantially equalto thatof the interior of said casing, gear wheels secured respectively to the said drum and to the said cut-ofi' means, the said gear wheels being of equal diameter and in engagement with each other, and means for driving one of the said wheels whereby the other one of the said wheels and the part connected thereto are also revolubly driven, the speed of revolution of the surface of the drum being greater than the speed of revolution of the surface of the cut-off means.

5. In a spiral pump, the combination of a cylindrical hollow casing, a cylindrical revoluble member situated in the said casing and having a spiral passage-way extending therethrough, revoluble means cooperating with said member for the purpose stated, the speed of revolution of the surface of the said cylindrical member being greater than the speed of revolution of the surface of the oluble means being provided with a recess having a curved bottom the radius of ourvature of which is substantially the same as that of the interior of the said cylindrical caslng and the surface of the curved bottom of said recess being flush or nearly flush with the adjacent portion of the surface of the interior of the cylindrical casing.

6. In a spiral pump, the combination of the casing, a revoluble drum situated in the said casing and having a spiral passage-way extending therethrough, revoluble cut-01f .means cooperating with the said drum for the purpose stated, and means whereby the speed of revolution of the surface of the said revoluble cut-off means is less than that of the co-acting surface of the said revoluble drum.

p 7 In a spiral pump, the combination of the casing, a revoluble drum situated in the said casing and having aspiral passage-way extending therethrough, revoluble cut-off means cooperating with the said drum for the purpose stated, and means for rotating the axes of the said drum and the said revoluble cut-off means at the same rate of speed, the diameter of the said revoluble cutoff means being less than that of the diameter of the said drum whereby the speed of movement of the surface of the said revoluble cut-off means is less than that-of the cooperating surface of the said drum.

8. In a spiral pump, the combination of a cylindrical casing, a revoluble drum situated therein of less diameter than the internal diameter of the said casing whereby an annular chamber is formed between the said drum and the said casing and the said drum having means thereon for closing the said annular chamber, a revoluble cylindrical cutofi means cooperating with the said drum, the said means having a recess to permit the passage of the means upon the said drum for closing the said annular chamber, and means whereby the speed of revolution of the cylindrical surface of the said cut-ofi' means is less than that of the cooperating cylindrical surface of the drum for the purpose stated.

9. In a spiral pump, the combination of the casing, having..:a cylindrical chamber, a

revoluble drum situated in the said casing and having a spiral passage-way extending therethrough, a revoluble cylindrical member situated eccentrically of the said casing and projecting into the chamber thereof, the

said cylindrical member having a recess therein of a width such that when the said at a less speed than that of the cooperating surface of the said drum.

situated outside of the said 10. In a spiral pump the combination of the casing having a cylindrical chamber, a revoluble drum situated in the said casing, said drum being of less diameter than the said casing and said drum having a spiral passage-way extending therethrough, a revoluble cylindrical member situated eccentrically of the said casing and projecting into the chamber thereof, the said cylindrical member having a recess therein of a width such thatwhen the said recess faces toward the said chamber its opposite edges dov not project within said chamber.

11. In a spiral pump the combination of the casing having a cylindrical chamber, a revoluble drum situated in the said casing which drum is of less diameter than said casing whereby there is formed an annular chamber between said drum and the said casjection which closes 'thesaid annular chamber and said drum being also provided with a spiral passage-way J extending therethrough, a revoluble cylindrical member situated eccentrically of the said casing and projecting into the chamber thereof the said cylindrical member having a recess therein of a width such that when the said recess faces toward the said chamber its opposite edges do not project intosaid chamber.

12. In a spiral pump the. c0mbination of the casing, a drum situated-in the said casing and having a spiral passage-way extending therethrough, revoluble means of less diameter than said drum and cooperating therewith for the purpose stated,-the speed of revolution of the surface of said drum being greater than the speed of revolutlon of the surface of said revoluble means, the said revoluble means being provided with a recessv having a curved bottom with a said. drum being provided with a proradius of curvature substantially the same THOMAS OCONNOR. In the presence of-- CYRUs N. ANDERSON, CARRIE E. KLEINFELDER. 

